Updated lxc container from debian 8 to debian 9 now it wont start

D

Dustin

New Member
Jan 28, 2018
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0
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This issue seems to be reproducible. If i create a debian 9 container from scratch it will run fine, but if i upgrade debian 8 to debian 9 the container no longer starts.

Code: 
$ cat /etc/debian_version

9.3


$ cat /etc/apt/sources.list
deb http       ://ftp.us.debian.org/debian stretch main contrib
# deb http       ://download.proxmox.com/debian jessie pve-no-subscription
# security updates
deb http       ://security.debian.org stretch/updates main contrib

$ cat /etc/apt/sources.list.d/pve-enterprise.list
# deb http      ://ftp.debian.org/debian stretch main contrib

# PVE pve-no-subscription repository provided by proxmox.com,
# NOT recommended for production use
deb http      ://download.proxmox.com/debian/pve stretch pve-no-subscription

# security updates
# deb http      ://security.debian.org stretch/updates main contrib


Code: 
$ sudo lxc-start --name=120 --foreground --logfile log
lxc-start: 120: tools/lxc_start.c: main: 371 The container failed to start.
lxc-start: 120: tools/lxc_start.c: main: 375 Additional information can be obtained by setting the --logfile and --logpriority options.

$ cat log
      lxc-start 120 20180129211952.193 ERROR    lxc_start_ui - tools/lxc_start.c:main:371 - The container failed to start.
      lxc-start 120 20180129211952.193 ERROR    lxc_start_ui - tools/lxc_start.c:main:375 - Additional information can be obtained by setting the --logfile and --logpriority options.


Code: 
$ sudo pct config 120
arch: amd64
cores: 2
hostname: wiki-temp
lock: mounted
memory: 1024
nameserver: 10.8.8.1
net0: name=eth0,bridge=vmbr0,gw=10.8.8.1,hwaddr=EE:4C:71:FF:AD:C7,ip=10.8.
8.51/24,ip6=dhcp,type=veth
onboot: 1
ostype: debian
rootfs: Data-Parity:120/vm-120-disk-1.raw,size=21G
searchdomain:
swap: 512

Code: 
$ pveversion --verbose
proxmox-ve: 5.1-38 (running kernel: 4.13.13-5-pve)
pve-manager: 5.1-43 (running version: 5.1-43/bdb08029)
pve-kernel-4.4.10-1-pve: 4.4.10-54
pve-kernel-4.2.6-1-pve: 4.2.6-36
pve-kernel-4.4.35-1-pve: 4.4.35-77
pve-kernel-4.13.13-5-pve: 4.13.13-38
pve-kernel-4.4.67-1-pve: 4.4.67-92
libpve-http-server-perl: 2.0-8
lvm2: 2.02.168-pve6
corosync: 2.4.2-pve3
libqb0: 1.0.1-1
pve-cluster: 5.0-19
qemu-server: 5.0-20
pve-firmware: 2.0-3
libpve-common-perl: 5.0-25
libpve-guest-common-perl: 2.0-14
libpve-access-control: 5.0-7
libpve-storage-perl: 5.0-17
pve-libspice-server1: 0.12.8-3
vncterm: 1.5-3
pve-docs: 5.1-16
pve-qemu-kvm: 2.9.1-6
pve-container: 2.0-18
pve-firewall: 3.0-5
pve-ha-manager: 2.0-4
ksm-control-daemon: 1.2-2
glusterfs-client: 3.8.8-1
lxc-pve: 2.1.1-2
lxcfs: 2.0.8-1
criu: 2.11.1-1~bpo90
novnc-pve: 0.6-4
smartmontools: 6.5+svn4324-1
zfsutils-linux: 0.7.4-pve2~bpo9
 
Last edited:
we have 20 lxc's which were upgraded from jessie to stretch. I did that some time ago.

there were sometimes issues . I used debug and logging to find out the issues:
Code: 
lxc-start -n  120    -F --logfile=/root/lxc.log --logpriority=debug
 
Thanks, looking through it now

Code: 
lxc-start 120 20180130061104.120 INFO     lxc_start_ui - tools/lxc_start.c:main:280 - using rcfile /var/lib/lxc/120/config
      lxc-start 120 20180130061104.121 INFO     lxc_lsm - lsm/lsm.c:lsm_init:48 - LSM security driver AppArmor
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:435 - processing: .reject_force_umount  # comment this to allow umount -f;  not recommended.
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:610 - Adding native rule for reject_force_umount action 0(kill).
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:do_resolve_add_rule:276 - Setting Seccomp rule to reject force umounts.
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:614 - Adding compat rule for reject_force_umount action 0(kill).
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:do_resolve_add_rule:276 - Setting Seccomp rule to reject force umounts.
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:do_resolve_add_rule:276 - Setting Seccomp rule to reject force umounts.
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:435 - processing: .[all].
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:435 - processing: .kexec_load errno 1.
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:610 - Adding native rule for kexec_load action 327681(errno).
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:614 - Adding compat rule for kexec_load action 327681(errno).
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:435 - processing: .open_by_handle_at errno 1.
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:610 - Adding native rule for open_by_handle_at action 327681(errno).
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:614 - Adding compat rule for open_by_handle_at action 327681(errno).
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:435 - processing: .init_module errno 1.
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:610 - Adding native rule for init_module action 327681(errno).
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:614 - Adding compat rule for init_module action 327681(errno).
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:435 - processing: .finit_module errno 1.
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:610 - Adding native rule for finit_module action 327681(errno).
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:614 - Adding compat rule for finit_module action 327681(errno).
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:435 - processing: .delete_module errno 1.
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:610 - Adding native rule for delete_module action 327681(errno).
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:614 - Adding compat rule for delete_module action 327681(errno).
      lxc-start 120 20180130061104.121 INFO     lxc_seccomp - seccomp.c:parse_config_v2:624 - Merging in the compat Seccomp ctx into the main one.
      lxc-start 120 20180130061104.121 INFO     lxc_conf - conf.c:run_script_argv:457 - Executing script "/usr/share/lxc/hooks/lxc-pve-prestart-hook" for container "120", config section "lxc".
      lxc-start 120 20180130061104.922 DEBUG    lxc_start - start.c:setup_signal_fd:301 - Set SIGCHLD handler with file descriptor: 5.
      lxc-start 120 20180130061104.922 DEBUG    console - console.c:lxc_console_peer_default:459 - using "/dev/tty" as peer tty device
      lxc-start 120 20180130061104.922 DEBUG    console - console.c:lxc_console_sigwinch_init:151 - process 27500 created signal fd 9 to handle SIGWINCH events
      lxc-start 120 20180130061104.922 DEBUG    console - console.c:lxc_console_winsz:71 - set winsz dstfd:6 cols:211 rows:50
      lxc-start 120 20180130061104.922 INFO     lxc_start - start.c:lxc_init:680 - container "120" is initialized
      lxc-start 120 20180130061104.924 INFO     lxc_conf - conf.c:run_script:507 - Executing script "/usr/share/lxc/lxcnetaddbr" for container "120", config section "net".
      lxc-start 120 20180130061105.568 DEBUG    lxc_network - network.c:instantiate_veth:219 - Instantiated veth "veth120i0/vethLSAVRG", index is "33"
      lxc-start 120 20180130061105.568 INFO     lxc_cgroup - cgroups/cgroup.c:cgroup_init:67 - cgroup driver cgroupfs-ng initing for 120
      lxc-start 120 20180130061105.568 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:filter_and_set_cpus:469 - No isolated cpus detected.
      lxc-start 120 20180130061105.568 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:handle_cpuset_hierarchy:640 - "cgroup.clone_children" was already set to "1".
      lxc-start 120 20180130061105.570 INFO     lxc_start - start.c:lxc_spawn:1259 - Cloned CLONE_NEWNS.
      lxc-start 120 20180130061105.570 INFO     lxc_start - start.c:lxc_spawn:1259 - Cloned CLONE_NEWPID.
      lxc-start 120 20180130061105.570 INFO     lxc_start - start.c:lxc_spawn:1259 - Cloned CLONE_NEWUTS.
      lxc-start 120 20180130061105.570 INFO     lxc_start - start.c:lxc_spawn:1259 - Cloned CLONE_NEWIPC.
      lxc-start 120 20180130061105.570 INFO     lxc_start - start.c:lxc_spawn:1259 - Cloned CLONE_NEWNET.
      lxc-start 120 20180130061105.570 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'memory.limit_in_bytes' set to '1073741824'
      lxc-start 120 20180130061105.570 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'memory.memsw.limit_in_bytes' set to '1610612736'
      lxc-start 120 20180130061105.570 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'cpu.shares' set to '1024'
      lxc-start 120 20180130061105.570 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'cpuset.cpus' set to '7-8'
      lxc-start 120 20180130061105.570 INFO     lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2137 - cgroup has been setup
      lxc-start 120 20180130061105.617 DEBUG    lxc_network - network.c:lxc_network_move_created_netdev_priv:2450 - Moved network device "vethLSAVRG"/"eth0" to network namespace of 27575
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.deny' set to 'a'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c *:* m'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'b *:* m'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 1:3 rwm'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 1:5 rwm'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 1:7 rwm'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 5:0 rwm'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 5:1 rwm'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 5:2 rwm'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 1:8 rwm'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 1:9 rwm'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 136:* rwm'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 10:229 rwm'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 254:0 rm'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 10:200 rwm'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 10:228 rwm'
      lxc-start 120 20180130061105.618 DEBUG    lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2132 - cgroup 'devices.allow' set to 'c 10:232 rwm'
      lxc-start 120 20180130061105.618 INFO     lxc_cgfsng - cgroups/cgfsng.c:cgfsng_setup_limits:2137 - cgroup has been setup
      lxc-start 120 20180130061105.619 INFO     lxc_start - start.c:do_start:925 - Unshared CLONE_NEWCGROUP.
      lxc-start 120 20180130061105.620 DEBUG    storage - storage/storage.c:storage_query:252 - Detected rootfs type "dir"
      lxc-start 120 20180130061105.620 DEBUG    lxc_conf - conf.c:lxc_setup_rootfs:1319 - Mounted rootfs "/var/lib/lxc/120/rootfs" onto "/usr/lib/x86_64-linux-gnu/lxc/rootfs" with options "(null)".
      lxc-start 120 20180130061105.620 INFO     lxc_conf - conf.c:setup_utsname:768 - 'wiki-temp' hostname has been setup
      lxc-start 120 20180130061105.641 DEBUG    lxc_network - network.c:setup_hw_addr:2716 - Mac address "EE:4C:71:FF:AD:C7" on "eth0" has been setup
      lxc-start 120 20180130061105.641 DEBUG    lxc_network - network.c:lxc_setup_netdev_in_child_namespaces:2974 - Network device "eth0" has been setup
      lxc-start 120 20180130061105.641 INFO     lxc_network - network.c:lxc_setup_network_in_child_namespaces:3002 - network has been setup
      lxc-start 120 20180130061105.641 INFO     lxc_conf - conf.c:mount_autodev:1149 - Preparing "/dev"
      lxc-start 120 20180130061105.641 INFO     lxc_conf - conf.c:mount_autodev:1171 - Mounted tmpfs on "/usr/lib/x86_64-linux-gnu/lxc/rootfs/dev"
      lxc-start 120 20180130061105.641 INFO     lxc_conf - conf.c:mount_autodev:1188 - Prepared "/dev"
      lxc-start 120 20180130061105.642 DEBUG    lxc_conf - conf.c:mount_entry:1863 - Remounting "/sys/fs/fuse/connections" on "/usr/lib/x86_64-linux-gnu/lxc/rootfs/sys/fs/fuse/connections" to respect bind or remount options
      lxc-start 120 20180130061105.642 DEBUG    lxc_conf - conf.c:mount_entry:1884 - Flags for "/sys/fs/fuse/connections" were 4096, required extra flags are 0
      lxc-start 120 20180130061105.642 DEBUG    lxc_conf - conf.c:mount_entry:1894 - Mountflags already were 4096, skipping remount
      lxc-start 120 20180130061105.642 DEBUG    lxc_conf - conf.c:mount_entry:1921 - Mounted "/sys/fs/fuse/connections" on "/usr/lib/x86_64-linux-gnu/lxc/rootfs/sys/fs/fuse/connections" with filesystem type "none"
      lxc-start 120 20180130061105.642 INFO     lxc_conf - conf.c:mount_file_entries:2212 - Set up mount entries
      lxc-start 120 20180130061105.642 INFO     lxc_conf - conf.c:run_script_argv:457 - Executing script "/usr/share/lxcfs/lxc.mount.hook" for container "120", config section "lxc".
      lxc-start 120 20180130061105.663 INFO     lxc_conf - conf.c:run_script_argv:457 - Executing script "/usr/share/lxc/hooks/lxc-pve-autodev-hook" for container "120", config section "lxc".
      lxc-start 120 20180130061105.923 INFO     lxc_conf - conf.c:lxc_fill_autodev:1224 - Populating "/dev"
      lxc-start 120 20180130061105.923 DEBUG    lxc_conf - conf.c:lxc_fill_autodev:1270 - Created device node "/usr/lib/x86_64-linux-gnu/lxc/rootfs/dev/null"
      lxc-start 120 20180130061105.923 DEBUG    lxc_conf - conf.c:lxc_fill_autodev:1270 - Created device node "/usr/lib/x86_64-linux-gnu/lxc/rootfs/dev/zero"
      lxc-start 120 20180130061105.923 DEBUG    lxc_conf - conf.c:lxc_fill_autodev:1270 - Created device node "/usr/lib/x86_64-linux-gnu/lxc/rootfs/dev/full"
      lxc-start 120 20180130061105.923 DEBUG    lxc_conf - conf.c:lxc_fill_autodev:1270 - Created device node "/usr/lib/x86_64-linux-gnu/lxc/rootfs/dev/urandom"
      lxc-start 120 20180130061105.923 DEBUG    lxc_conf - conf.c:lxc_fill_autodev:1270 - Created device node "/usr/lib/x86_64-linux-gnu/lxc/rootfs/dev/random"
      lxc-start 120 20180130061105.923 DEBUG    lxc_conf - conf.c:lxc_fill_autodev:1270 - Created device node "/usr/lib/x86_64-linux-gnu/lxc/rootfs/dev/tty"
      lxc-start 120 20180130061105.923 INFO     lxc_conf - conf.c:lxc_fill_autodev:1275 - Populated "/dev"
      lxc-start 120 20180130061105.923 DEBUG    lxc_conf - conf.c:lxc_setup_dev_console:1603 - mounted pts device "/dev/pts/1" onto "/usr/lib/x86_64-linux-gnu/lxc/rootfs/dev/console"
      lxc-start 120 20180130061105.923 INFO     lxc_utils - utils.c:lxc_mount_proc_if_needed:1758 - I am 1, /proc/self points to "1"
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:setup_rootfs_pivot_root:1127 - pivot_root syscall to '/usr/lib/x86_64-linux-gnu/lxc/rootfs' successful
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:setup_pivot_root:1436 - finished pivot root
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:lxc_setup_devpts:1481 - mount new devpts instance with options "newinstance,ptmxmode=0666,mode=0620,gid=5,max=1024"
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:lxc_setup_devpts:1501 - created dummy "/dev/ptmx" file as bind mount target
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:lxc_setup_devpts:1506 - bind mounted "/dev/pts/ptmx" to "/dev/ptmx"
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:lxc_allocate_ttys:964 - allocated pty "/dev/pts/0" with master fd 11 and slave fd 14
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:lxc_allocate_ttys:964 - allocated pty "/dev/pts/1" with master fd 15 and slave fd 16
      lxc-start 120 20180130061105.941 INFO     lxc_conf - conf.c:lxc_allocate_ttys:984 - finished allocating 2 pts devices
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:lxc_setup_ttys:921 - Bind mounted "/dev/pts/0" onto "/dev/tty1"
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:lxc_setup_ttys:921 - Bind mounted "/dev/pts/1" onto "/dev/tty2"
      lxc-start 120 20180130061105.941 INFO     lxc_conf - conf.c:lxc_setup_ttys:930 - Finished setting up 2 /dev/tty<N> device(s)
      lxc-start 120 20180130061105.941 INFO     lxc_conf - conf.c:setup_personality:1542 - set personality to '0x0'
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:setup_caps:2368 - drop capability 'mac_admin' (33)
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:setup_caps:2368 - drop capability 'mac_override' (32)
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:setup_caps:2368 - drop capability 'sys_time' (25)
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:setup_caps:2368 - drop capability 'sys_module' (16)
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:setup_caps:2368 - drop capability 'sys_rawio' (17)
      lxc-start 120 20180130061105.941 DEBUG    lxc_conf - conf.c:setup_caps:2377 - capabilities have been setup
      lxc-start 120 20180130061105.941 NOTICE   lxc_conf - conf.c:lxc_setup:3277 - Container "120" is set up
      lxc-start 120 20180130061105.941 INFO     lxc_apparmor - lsm/apparmor.c:apparmor_process_label_set:238 - changed apparmor profile to lxc-container-default-cgns
      lxc-start 120 20180130061105.943 NOTICE   lxc_start - start.c:start:1550 - Exec'ing "/sbin/init".
      lxc-start 120 20180130061105.945 NOTICE   lxc_start - start.c:post_start:1561 - Started "/sbin/init" with pid "27575".
      lxc-start 120 20180130061105.945 NOTICE   lxc_start - start.c:signal_handler:350 - Received SIGCHLD from pid 27517 instead of container init 27575.
      lxc-start 120 20180130061105.976 DEBUG    lxc_start - start.c:signal_handler:354 - Container init process 27575 exited.
      lxc-start 120 20180130061105.976 INFO     lxc_error - error.c:lxc_error_set_and_log:49 - Child <27575> ended on error (127)
      lxc-start 120 20180130061105.976 INFO     lxc_network - network.c:lxc_delete_network_priv:2534 - Interface "eth0" with index 33 already deleted or existing in different network namespace
      lxc-start 120 20180130061105.976 INFO     lxc_network - network.c:lxc_delete_network_priv:2544 - Removed interface "eth0" with index 33
      lxc-start 120 20180130061106.454 INFO     lxc_network - network.c:lxc_delete_network_priv:2565 - Removed interface "veth120i0" from ""
      lxc-start 120 20180130061106.454 DEBUG    lxc_network - network.c:lxc_delete_network:3129 - Deleted network devices
      lxc-start 120 20180130061106.103 INFO     lxc_conf - conf.c:run_script_argv:457 - Executing script "/usr/share/lxcfs/lxc.reboot.hook" for container "120", config section "lxc".
      lxc-start 120 20180130061106.606 INFO     lxc_conf - conf.c:run_script_argv:457 - Executing script "/usr/share/lxc/hooks/lxc-pve-poststop-hook" for container "120", config section "lxc".
      lxc-start 120 20180130061107.247 ERROR    lxc_start_ui - tools/lxc_start.c:main:371 - The container failed to start.
      lxc-start 120 20180130061107.247 ERROR    lxc_start_ui - tools/lxc_start.c:main:375 - Additional information can be obtained by setting the --logfile and --logpriority options.
 
based on the init error,
you may also check /var/log/syslog and others logs at /var/log/ within the lxc.

for zfs storage that is usually easy. what type of storage are you using?
 
We are using a software raid with mdadm.

looks like there is an ext4-fs error

from /var/log/syslog:
Code: 
Jan 30 11:43:35 pve pct[25837]: <root@pam> starting task UPID:pve:000064EE:00CB79BC:5A70E707:vzstart:120:root@pam:
Jan 30 11:43:35 pve pct[25838]: starting CT 120: UPID:pve:000064EE:00CB79BC:5A70E707:vzstart:120:root@pam:
Jan 30 11:43:35 pve systemd[1]: Starting PVE LXC Container: 120...
Jan 30 11:43:36 pve systemd-udevd[25859]: Could not generate persistent MAC address for vethVMA1KS: No such file or directory
Jan 30 11:43:36 pve kernel: [133353.559926] EXT4-fs error (device loop1): ext4_iget:4691: inode #788030: comm rs:main Q:Reg: bad extra_isize 6657 (inode size 256)
Jan 30 11:43:36 pve kernel: [133354.010560] vmbr0: port 12(veth120i0) entered blocking state
Jan 30 11:43:36 pve kernel: [133354.010563] vmbr0: port 12(veth120i0) entered disabled state
Jan 30 11:43:36 pve kernel: [133354.010642] device veth120i0 entered promiscuous mode
Jan 30 11:43:36 pve kernel: [133354.076585] eth0: renamed from vethVMA1KS
Jan 30 11:43:36 pve systemd[1]: Started PVE LXC Container: 120.
Jan 30 11:43:36 pve kernel: [133354.406988] EXT4-fs error (device loop0): ext4_lookup:1580: inode #395511: comm init: deleted inode referenced: 395083
Jan 30 11:43:36 pve pct[25837]: <root@pam> end task UPID:pve:000064EE:00CB79BC:5A70E707:vzstart:120:root@pam: OK
Jan 30 11:43:36 pve kernel: [133354.493989] EXT4-fs error (device loop0): ext4_lookup:1580: inode #395511: comm init: deleted inode referenced: 395083
Jan 30 11:43:36 pve kernel: [133354.507035] vmbr0: port 12(veth120i0) entered disabled state
Jan 30 11:43:36 pve kernel: [133354.507324] device veth120i0 left promiscuous mode
Jan 30 11:43:36 pve kernel: [133354.507329] vmbr0: port 12(veth120i0) entered disabled state
Jan 30 11:43:38 pve systemd[1]: pve-container@120.service: Main process exited,code=exited, status=1/FAILURE
Jan 30 11:43:38 pve systemd[1]: pve-container@120.service: Unit entered failed state.
Jan 30 11:43:38 pve systemd[1]: pve-container@120.service: Failed with result 'exit-code'.
 
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